;Print a string ending in a null from SI.
printstr:

;Store AX and SI in the stack
push ax
push si

;Print the string
;Load the current character
.loop:
lodsb
;Check for the string end
cmp al, 0x0
je .done
;Print the character
mov ah, 0xe
int 0x10
;Print the next character
jmp .loop

;Load the initial registers from the stack
.done:
pop si
pop ax

;Return
iret